Telegraph-sounder



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JOHN W. DELliIEGE, OF NQRTH BILLERI OA, MASSACHUSETTS.

TELEGRAPH-SGUNDER.

SPECIFICATION forming part of Letters Patent No. 319,201, dated June 2, 1885.

Application filed December it, 1884. (No more.) 7 I I To all whom it may concern:

Be it known that I, J OHN W. DELMEGE, a citizen of the United States, residing at North Billerica, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Telegraph-Sounders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- 5 Figure 1 is a perspective view of a telegraph-sounder constructed in accordance with my invention. Fig. 2 is a vertical section through the center of the same.

My invention has for its object to simplify the construction of telegraphic sounding-instruments, and enablethem to produce a louder and clearer sound without unnecessary vibra-' tion or ringing, and with much less batterypower than heretofore; and my invention consists in the combination, with a pair of electromagnets and a metallic sounding-frame having at its upper and lower ends screws or anvils, of a sounding post or bar carrying the armature of the electro-magnets and sliding in guides or bearings in the said soundingframe, and operated longitudinally in one direction by the said magnets, and in the opposite direction by a spring, whereby its upper and lower ends are alternately brought into contact with the upper and lower anvils to produce the signals, as hereinafter set forth.

In the said drawings, A represents the baseboard of my telegraph-sounder, within which is inserted the metal plate I), to which are secured at two opposite ends the two electromagnets B 13, which are connected in the usual manner with the battery and the main line by wires entering the binding-posts o c.

D represents the metallic sounding'frame, of the form shown, which is placed centrally be tween the two electro-magnets B B, and is secured at its lower ends, by means of screws 6, to the plate b, which forms the bottom of the frame,

G is the sounding post or bar, which slides freely in guides or bearings 5 in the transverse bars at of the frame D, the upper end of the post G being turned down, leaving a shoulder,

f, on which rests the armature H, which is firmly secured to the sounding-post beneath the upper bar, d of the frame D,

g is a screw, which passes up through the plate I) in line with the axis of the sounding post G, and constitutes the lower anvil, against which the lower end of the sounding-post G is caused to strike when the electro-inagnets are charged, and 72, is a th umbscrew, which passes down through the top of the frame D immediately in line with the post G, and forms the upper anvil, against which the upper extremity of the said post is caused to strike when the armature H is released by the discharging of the electro-magnets by means of a lever, t, pivoted to the frame D, the inner end of this lever entering a recess in the post G, and its outer end being connected with a spring, k, the tension of which is regulated by turning the nut Z on the screw m, to which the spring is attached. If desired, the lever 73 may be dispensed with and the spring it connected directly with the sounding-post without the employment of any intermediate mechanism. lhe screw h is provided above the top of the frame D with a check-nut, a, to confine it tightly when adjusted, and by turning this screw h the sounding-post G can be adjusted to vary the length of its stroke, whereby more or less sound, or a variation in the tone, is produced, as the post, by the alternate action of the electro-magnets B B and spring is, is moved up and down in its bearings 5 in the frame to bring its opposite ends alternately into contact with the anvils lug. The armature H is adjusted nearer to or farther from the electromagnets, as may be found desirable, by turning the lower screw or anvil, g, which thus limits the downward movement of the sounding-post, which carries the armature. The sounding-post and armature have a free and easy movement with the action of the key, and are not liable to stick or bind, as frequently occurs with the lever of an ordinarysoundinginstrument if the fulcrumscrews are unduly tightened through the carelessness or ignorance of the operator. The metallic sounding-frame D is of such shape and size as to produce the signals in a loud, clear, and firm tone when the post G strikes the anvils, and by arranging this frame D between the two electro-magnets the instrument can be made exceedingly compact, and is, moreover, of very simple construction and not liable to get out of order.

One of the principal advantages of my improved construction is, thatalouder and clearer sound can be produced with a single cell of battery than can be produced with two cells of battery, where the ordinary lever-sounder in common use is employed, as there is no leverage to overcome, and much less force is required to bring the sounding-post into contact with the anvils with sufficient force to produce the required volume of sound than is required to operate the sounder-lever of an ordinary instrument, a material saving in bat;- tery-power being thus effected, which is a very important consideration. Furthermore, lessresistance is produced on the transmitting key on account of the ease with which my improved sounder is operated.

I do not claim, broadly, a sounding post or bar adapted to move vertically between two anvils, as I am aware that such construction is not new; but

JOHN W. DELMEGE,

In presence of- P. E. TESOHEMAOHER, W. J CAMBRIDGE. 

